scholarly journals A Comparative Study of Proteolytic Mechanisms during Leaf Senescence of Four Genotypes of Winter Oilseed Rape Highlighted Relevant Physiological and Molecular Traits for NRE Improvement

Plants ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
Alexandra Girondé ◽  
Marine Poret ◽  
Philippe Etienne ◽  
Jacques Trouverie ◽  
Alain Bouchereau ◽  
...  
Keyword(s):  
Comparative Study ◽  
Oilseed Rape ◽  
Leaf Senescence ◽  
Winter Oilseed Rape

Light Restriction Delays Leaf Senescence in Winter Oilseed Rape (Brassica napus L.)

2013 ◽  
Vol 32 (3) ◽  
pp. 506-518 ◽  
Author(s):  
Sophie Brunel-Muguet ◽  
Patrick Beauclair ◽  
Marie-Paule Bataillé ◽  
Jean-Christophe Avice ◽  
Jacques Trouverie ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Leaf Senescence ◽  
Winter Oilseed Rape ◽  
Brassica Napus L

The superior nitrogen efficiency of winter oilseed rape (Brassica napus L.) hybrids is not related to delayed nitrogen starvation-induced leaf senescence

2014 ◽  
Vol 384 (1-2) ◽  
pp. 347-362 ◽  
Author(s):  
Fabian Koeslin-Findeklee ◽  
Andreas Meyer ◽  
Andreas Girke ◽  
Katrin Beckmann ◽  
Walter J. Horst
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Leaf Senescence ◽  
Nitrogen Starvation ◽  
Nitrogen Efficiency ◽  
Winter Oilseed Rape ◽  
Brassica Napus L

Transcriptomic analysis of nitrogen starvation- and cultivar-specific leaf senescence in winter oilseed rape ( Brassica napus L.)

Plant Science ◽  
2015 ◽  
Vol 233 ◽  
pp. 174-185 ◽  
Author(s):  
Fabian Koeslin-Findeklee ◽  
Vajiheh Safavi Rizi ◽  
Martin A. Becker ◽  
Sebastian Parra-Londono ◽  
Muhammad Arif ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Leaf Senescence ◽  
Nitrogen Starvation ◽  
Transcriptomic Analysis ◽  
Winter Oilseed Rape ◽  
Brassica Napus L

scholarly journals Characterization of senescence-associated protease activities involved in the efficient protein remobilization during leaf senescence of winter oilseed rape

Plant Science ◽  
2016 ◽  
Vol 246 ◽  
pp. 139-153 ◽  
Author(s):  
Marine Poret ◽  
Balakumaran Chandrasekar ◽  
Renier A.L. van der Hoorn ◽  
Jean-Christophe Avice
Keyword(s):  
Oilseed Rape ◽  
Leaf Senescence ◽  
Winter Oilseed Rape

scholarly journals Leaf Phenological Stages of Winter Oilseed Rape (Brassica napus L.) Have Conserved Photosynthetic Efficiencies but Contrasted Intrinsic Water Use Efficiencies at High Light Intensities

2021 ◽  
Vol 12 ◽  
Author(s):  
Younès Dellero ◽  
Mathieu Jossier ◽  
Alain Bouchereau ◽  
Michael Hodges ◽  
Laurent Leport
Keyword(s):  
Water Use ◽  
Oilseed Rape ◽  
Leaf Senescence ◽  
Leaf Water Content ◽  
Winter Oilseed Rape ◽  
Phenological Stages ◽  
Bisphosphate Carboxylase ◽  
Chlorophyll Fluorescence Parameters ◽  
Light Intensities ◽  
Intrinsic Water Use Efficiency

Leaf senescence in source leaves leads to the active degradation of chloroplast components [photosystems, chlorophylls, ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco)] and plays a key role in the efficient remobilization of nutrients toward sink tissues. However, the progression of leaf senescence can differentially modify the photosynthetic properties of source leaves depending on plant species. In this study, the photosynthetic and respiratory properties of four leaf ranks of oilseed rape describing leaf phenological stages having different sink-source activities were analyzed. To achieve this, photosynthetic pigments, total soluble proteins, Rubisco amounts, and the light response of chlorophyll fluorescence parameters coupled to leaf gas exchanges and leaf water content were measured. Photosynthetic CO2 assimilation and electron transfer rates, Rubisco and chlorophyll levels per leaf area were gradually decreased between young, mature and senescent leaves but they remained highly correlated at saturating light intensities. However, senescent leaves of oilseed rape had a lower intrinsic water use efficiency compared to young and mature leaves at saturating light intensities that was mainly due to higher stomatal conductance and transpiration rate with respect to stomatal density and net CO2 assimilation. The results are in favor of a concerted degradation of chloroplast components but a contrasted regulation of water status between leaves of different phenological stages of winter oilseed rape.

scholarly journals A novel deletion in FLOWERING LOCUS T modulates flowering time in winter oilseed rape

2021 ◽  
Author(s):  
Paul Vollrath ◽  
Harmeet S. Chawla ◽  
Sarah V. Schiessl ◽  
Iulian Gabur ◽  
HueyTyng Lee ◽  
...  
Keyword(s):  
Association Mapping ◽  
Flowering Time ◽  
Oilseed Rape ◽  
Major Effect ◽  
Structural Variants ◽  
Winter Oilseed Rape ◽  
Flowering Locus T ◽  
Winter Type ◽  
Long Read ◽  
Flowering Locus

Abstract Key message A novel structural variant was discovered in the FLOWERING LOCUS T orthologue BnaFT.A02 by long-read sequencing. Nested association mapping in an elite winter oilseed rape population revealed that this 288 bp deletion associates with early flowering, putatively by modification of binding-sites for important flowering regulation genes. Abstract Perfect timing of flowering is crucial for optimal pollination and high seed yield. Extensive previous studies of flowering behavior in Brassica napus (canola, rapeseed) identified mutations in key flowering regulators which differentiate winter, semi-winter and spring ecotypes. However, because these are generally fixed in locally adapted genotypes, they have only limited relevance for fine adjustment of flowering time in elite cultivar gene pools. In crosses between ecotypes, the ecotype-specific major-effect mutations mask minor-effect loci of interest for breeding. Here, we investigated flowering time in a multiparental mapping population derived from seven elite winter oilseed rape cultivars which are fixed for major-effect mutations separating winter-type rapeseed from other ecotypes. Association mapping revealed eight genomic regions on chromosomes A02, C02 and C03 associating with fine modulation of flowering time. Long-read genomic resequencing of the seven parental lines identified seven structural variants coinciding with candidate genes for flowering time within chromosome regions associated with flowering time. Segregation patterns for these variants in the elite multiparental population and a diversity set of winter types using locus-specific assays revealed significant associations with flowering time for three deletions on chromosome A02. One of these was a previously undescribed 288 bp deletion within the second intron of FLOWERING LOCUS T on chromosome A02, emphasizing the advantage of long-read sequencing for detection of structural variants in this size range. Detailed analysis revealed the impact of this specific deletion on flowering-time modulation under extreme environments and varying day lengths in elite, winter-type oilseed rape.

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